-1*open +1*p5  >= 0
-1*p1  + 1 >= 0
-1*p2  + 1 >= 0
-1*p3  + 1 >= 0
-1*p4  + 1 >= 0
-1*p5  + 3 >= 0
1*p4  >= 0
1*p3  >= 0
1*p2  >= 0
1*p1  >= 0
1*open  >= 0
1*chair  >= 0
1*barber  >= 0